Description Of Components - Kenwood TK-373G Service Manual

TK-373G
SEMICONDUCTOR DATA / DESCRIPTION OF COMPONENTS
Pin Port
I/O
No. Name
49 A19 - Not used
50-59 A18-A9 - Flash memory address bus
60 VCC - +5V
61 A8 - Flash memory address bus
62 VSS - GND
63-70 A7-A0 - Flash memory address bus
71-75 KIN0-KIN4 I Key scan input
76 PLLUL O PLL unlock detect input
77 PLLSTB O PLL strobe output
78 SAVE I Not used
79-86 D7-D0 - Flash memory data bus
87 KEYAD I MONI LAMP key input
88 BATT I Battery voltage input
89 RFDAT O PLL data output
90 RFCLK O PLL clock output
91 NC - NC
92 RSSQL I Receive signal strength indicator input
93 ANLSQL I Analog squelch level input
94 AVSS - GND
95 TOI I QT/DQT/LTR signal input
96 VREF - Reference voltage input
97 AVCC - GND
98 DTMPD O Not used
99 DTMCLK O Not used
100 DTMDAT I Not used
Shift register 1:BU4094BCFV(IC5)
Pin function
Pin
Port I/O
No.
4 W/N O Wide/Narrow SW
5 MUTE O RX audio/MIC mute
6 NC O NC
7 LED0 O RED LED
11 BSHIFT O Beat Shift
12 REG2 O Base Band IC inter register select 2
13 REG1 O Base Band IC inter register select 1
14 LED1 O GREEN LED
Shift register 2:BU4094BCFV(IC6)
Pin function
Pin
Port I/O
No.
4 5MC O 5MC control
5 5RC O 5R control
6 5TC O 5T control
7 SPMUTE O AF amp power supply control Power on: H
11 AUX6 O Option board port 6
12 AUX5 O Option board port 5
13 LCDBLK O LCD back light
14 RX O RX/TX VCO SW
16
Function
unlock: L
Latch: L
Function
Narrow: L
Mute: L
LED lights: H
Shift on: H
LED lights: H
Function
Power on: L
Power on: L
Power on: H
Auxiliary Output
Link complete
Back light on: L
RX: L

DESCRIPTION OF COMPONENTS

DISPLAY UNIT (X54-3250-11)
Ref. No. Use/Function
IC501 IC LCD driver
Q501 Transistor Current driver
Q502 Transistor DC switch
D505 Diode Speed up
D506 LED LCD back light
D507 Diode Voltage reference
D511 LED LCD back light
D515,516 LED LED
TX-RX UNIT (X57-650X-XX)
Ref. No. Use/Function
IC1 IC RF Power Module
IC2 IC PLL system
IC3 IC Comparator (APC)
IC4 IC FM IF system
IC5,6 IC Shift register
IC7 IC Voltage regulator / 5V
IC8 IC Voltage detector / Reset
IC9 IC Voltage detector / INT
IC10 IC EEPROM
IC11 IC AF Power amplifier
IC12 IC Flash memory
IC13 IC Microprocessor
IC14 IC Audio processor
IC15(1/2) IC -
IC15(2/2) IC AF Pre amplifier
IC16(1/2) IC Bias buffer
IC16(2/2) IC AF Buffer amplifier
IC17 IC D/A converter (TX AF adjustment)
IC19 IC Active filter
Q1 Transistor PLL IC fin amplifier
Q2 Transistor VCO oscillation (TX)
Q3 Transistor RF Buffer amplifier
Q4,5 Transistor RF amplifier
Q6 Transistor RF amplifier
Q7 FET DC switch
Q8,Q9 Transistor DC switch
Q10 FET VCO oscillation (RX)
Q11 Transistor Ripple filter
Q12 Transistor Tripler
Q13 Transistor DC switch
nd
Q14 Transistor 2 IF W/N switch sets to on when Narrow
Q15 Transistor DC switch
Q16 Transistor DC switch
nd
Q17 Transistor 2 IF W/N switch sets to on when Wide
Q18 Transistor DC switch
Q19 FET Mixer
Q20,Q21 Transistor DC switch
Q22 Transistor IF amplifier
Q23 Transistor DC switch
Q24 Transistor DC switch
Q25 Transistor DC switch
Operation/Condition
/ LCD back light LED AVR
/Key pad back light
Operation/Condition
/ Output expander
/ For LSD in
/ TX driver
/ 5R
/ 5T, Save
/ 5T, Save
/ W/N audio amplitude adjust
/ LED (Red)
/ LED (Green)